Gazing down on the spectacular view from a mountaintop can take your breath away. That breathlessness is oftentimes more than just an awestruck reaction to the sights. It can be a symptom of altitude sickness, an illness that can strike hikers, mountain climbers, skiers and anyone who hits the 8,000-foot mark on a mountain.

Find out more about this degenerative disease of the brain by taking this quiz.

Answer this one: What is the most common cause of anemia?

What have you learned about anthrax since it became a real concern after Sept. 11, 2001?

Antibiotics have been called "wonder drugs," because of their ability to treat bacterial infections that were once deadly. Antibiotics have saved countless lives since they were first introduced 60 years ago. But over use of these drugs has allowed some bacteria to become resistant to them.

The human appendix is a three- to six-inch narrow tube located where the small and large intestines join. It's mostly known for becoming inflamed, affecting thousands of Americans each year. If you want to learn more about the appendix, take this quiz.

True or False: Arthritis affects only the wrist, ankle, and knee joints.

Each year, more than a million Americans die from heart attacks and other forms of coronary heart disease. Low-dose aspirin therapy is one weapon in the arsenal against heart disease that also includes healthy dieting, adequate exercise and not smoking. Learn more about aspirin's role in combating heart disease by taking this quiz

Assess your knowledge of the asthma basics with this quiz.

Are you a parent of a child with asthma? Take this quiz and stop feeling guilty.